Isobutane (data page)

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This page provides supplementary chemical data on isobutane.

Contents

[edit] Material Safety Data Sheet

The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source such as SIRI, and follow its directions.

[edit] Structure and properties

Structure and properties
Index of refraction, nD  ?
Abbe number ?
Dielectric constant, εr  ? ε0 at ? °C
Bond strength  ?
Bond length  ?
Bond angle  ?
Magnetic susceptibility  ?
Surface tension 10.3 dyn/cm at 20°C
    P ≈ 300 kPa

[edit] Thermodynamic properties

Phase behavior
Triple point 113.55K (–159.6 °C), 0.019481 Pa
Critical point 407.7 K (134.6 °C), 3650 kPa
Std enthalpy change
of fusion, ΔfusHo		 4.54 kJ/mol
Std entropy change
of fusion, ΔfusSo		 39.92 J/(mol·K)
Std enthalpy change
of vaporization, ΔvapHo		 21.3 kJ/mol
Std entropy change
of vaporization, ΔvapSo		 81.46 J/(mol·K)
Solid properties
Std enthalpy change
of formation, ΔfHosolid		  ? kJ/mol
Standard molar entropy,
Sosolid		  ? J/(mol K)
Heat capacity, cp  ? J/(mol K)
Liquid properties
Std enthalpy change
of formation, ΔfHoliquid		  ? kJ/mol
Standard molar entropy,
Soliquid		 200.79 J/(mol K)
Heat capacity, cp 129.70 J/(mol K) –253°C to –13°C
Gas properties
Std enthalpy change
of formation, ΔfHogas		 –134.2 kJ/mol
Standard molar entropy,
Sogas		 249.7 J/(mol K)
Enthalpy of combustion, ΔcHo –2869 kJ/mol
Heat capacity, cp 95.21 J/(mol K) at 20°C
van der Waals' constants[1] a = 1304.1 L2 kPa/mol2
b = 0.1142 liter per mole

[edit] Vapor pressure of liquid

P in mm Hg 1 10 40 100 400 760 1520 3800 7600 15200 30400 45600
T in °C –109.2 –86.4 –68.4 –54.1 –27.1 –11.7 7.5 39.0 68.8 99.5  —  —

Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.

Vapor pressure of iso-butane. From formula: obtained from Lange's Handbook of Chemistry, 10th ed.
Vapor pressure of iso-butane. From formula: \scriptstyle \log_{10} P_{mmHg} = 6.74808 - \frac {882.80} {240.0+T} obtained from Lange's Handbook of Chemistry, 10th ed.



[edit] Spectral data

UV-Vis
λmax  ? nm
Extinction coefficient, ε  ?
IR
Major absorption bands  ? cm−1
NMR
Proton NMR  
Carbon-13 NMR  
Other NMR data  
MS
Masses of
main fragments		  

[edit] References

  1. ^ Lange's Handbook of Chemistry 10th ed, pp 1522-1524

Except where noted otherwise, data relate to standard ambient temperature and pressure.

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